# OpeNoise — Noise level meter

> Real-time noise level meter with advanced analysis and community sharing. (iPhone/iPad app by Arpa Piemonte.)

- Source: https://appshunter.io/ios/app/openoise/id1387499991 (this page in markdown: same URL + `.md`)
- Developer: [Arpa Piemonte](https://appshunter.io/developer/1317255035)
- Category: Utilities
- Price: Free
- Rating: 4.00/5 from 4 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 18 MB
- Languages: American English
- Released: 2018-06-18
- Data updated: 2026-08-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/openoise/id1387499991/reviews.md

## What is OpeNoise?

OpeNoise is a real-time noise level meter.


TECHNICAL SPECIFICATIONS:
- Real-time A-weighted sound pressure level measurement
- Minimum and maximum level
- Third octave and FFT analysis
- Data saving in text file
- Calibration
- Displaying measurements on a map
- Metadata compilation
- Sharing calibration and measurements with the OpeNoise community

TERM OF USE
This app is not intended for professional use, it does not necessarily guarantee an accurate noise measurement.
Since each device has a different response to noise, a comparison with a professional noise level meter in the measurement dynamic range is required.
The utilization of the app requires adequate technical knowledge and skill; an extemporary measurement might not be correct.
The calibrations and measurements sent to the OpeNoise community will be used for statistical purposes only and cannot be used in any way to verify compliance with legal limits.

CREDITS
Developers: Arpa Piemonte (Regional Agency for the Protection of the Environment of Piedmont - Italy - www.arpa.piemonte.it).
The code is open source under GNU v.2 license or later, the code is on GitHub: https://github.com/Arpapiemonte/

KEYWORDS
noise level meter, level, sound, noise, measure, measurement, dB, db, dBA, dB(A), decibel

## Key features

- Real-time A-weighted sound pressure level measurement
- Minimum and maximum level tracking
- Third octave and FFT analysis
- Data saving in text file
- Calibration functionality
- Measurements displayed on a map
- Community sharing of calibration and measurements

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/openoise/id1387499991/reviews.md

### 5/5 — Does what it says on the tin

*2024-05-22*

It’s open source and it works very well. 5 stars

**Developer response:** Thanks!

### 5/5 — Works

*2024-04-20*

This app does what it says it does and no more.  I like it’s settings UI controls, though I wish it could display measurements faster than once per second.

**Developer response:** Thanks!

### 5/5 — Ottima App

*2024-03-26, version 3.1.1*

Per essere una app da smartphone è precisa, ho confrontato i risultati con un fonometro e sono molto simili

### 1/5 — Useless

*2023-08-12*

The app made no sense.  You click Start, as if you’re saving the readings.  Then at some point you click Stop, and save.  But then when you try to recall what you saved, it’s just a bunch of numbers that mean nothing.  Deleted the app after using it for several minutes.  Just useless.

**Developer response:** We are sorry that you are unable to use the app. The data saved in the text file represent sound levels. A brief explanation of how to use the app is on the information page, however, you must have some expertise in mathematics and acoustics to understand exactly what the data means.

### 4/5 — Ottima, quasi.

*2019-11-28, version 2.0.3*

Ottima app, ma c’è da migliorare il dark mode e renderla graficamente più integrata con iOS. Per il resto: ottima 👍

### 5/5 — OpeNoise

*2018-07-12*

This is a very comprehensive sound measurement system. It is worth considering calibrating against a professional standard. It’s linearity would then need to be tested. A very good suite of measurements in summary.

### 5/5 — Ottima App

*2018-06-19, version 2.0.0*

Perfetta e professionale

## Frequently asked questions about OpeNoise

### What is OpeNoise?

OpeNoise is a real-time noise level meter that measures sound pressure levels, minimum and maximum levels, and offers third octave and FFT analysis. It allows users to save data, calibrate the device, and share measurements with the OpeNoise community.

### Is OpeNoise suitable for professional noise measurements?

No, OpeNoise is explicitly not intended for professional use and does not guarantee accurate noise measurements for legal compliance. A comparison with a professional noise level meter is required for accurate dynamic range assessment.

### How does OpeNoise handle data?

OpeNoise can save measurement data in a text file. It also compiles metadata and allows for sharing of calibration and measurements with the OpeNoise community for statistical purposes.

### What devices does OpeNoise support?

OpeNoise is available for iPhone, iPad, and iPod devices.

### What is the age rating for OpeNoise?

OpeNoise has an age rating of 4+.

### How often is OpeNoise updated?

The latest version of OpeNoise is 3.3.0, last updated on January 7, 2026. The app was initially released on June 18, 2018.

### Does OpeNoise have ads?

OpeNoise is ad-free.

### What is the user sentiment for OpeNoise?

OpeNoise has a rating of 4.0 stars from 4 ratings, indicating generally positive user sentiment based on the available data.

## Version history (last 5 releases)

### 3.3.0 — 2026-01-07

performance improvement and minibug resolution

### 3.2.3 — 2024-12-12

performance improvement and minibug resolution

### 3.2.2 — 2024-05-22

- Displaying measurements on a map
- Metadata compilation
- Sharing calibration and measurements with the OpeNoise community

### 3.1.1 — 2023-10-03

- Added Marker functionality
- Improved save options
- Minibug fixed
- Improvement performace

### 3.0.4 — 2023-08-21

Performance improvement

## Apps similar to OpeNoise

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Sound Meter (Decibel)](https://appshunter.io/ios/app/sound-meter-decibel/id1626613141) | 4.5 (3,079) | Free | Utilities |
| [Decibel Meter · Sound Analyzer](https://appshunter.io/ios/app/decibel-meter-sound-analyzer/id1624503658) | 4.7 (1,296) | Free | Utilities |
| [NIOSH Sound Level Meter](https://appshunter.io/ios/app/niosh-sound-level-meter/id1096545820) | 4.7 (16,645) | Free | Utilities |
| [Decibel : dB Noise Level Meter](https://appshunter.io/ios/app/decibel-db-noise-level-meter/id6464403884) | 4.4 (250) | Free | Utilities |
| [Decibel X:dB Sound Level Meter](https://appshunter.io/ios/app/decibel-xdb-sound-level-meter/id448155923) | 4.6 (160,618) | Free | Utilities |
| [Decibel Metre (Sound Meter)](https://appshunter.io/ios/app/decibel-metre-sound-meter/id1590659820) | 4.5 (577) | Free | Utilities |

## More apps by Arpa Piemonte

- [LiveStorm](https://appshunter.io/ios/app/livestorm/id1290774890)
- [Meteo 3R](https://appshunter.io/ios/app/meteo-3r/id1462040579)
- [Aria+ Piemonte](https://appshunter.io/ios/app/aria-plus-piemonte/id1634624529)
- [#allertameteoPIE](https://appshunter.io/ios/app/allertameteopie/id6444004340)
- [Aineva](https://appshunter.io/ios/app/aineva/id6472720272)

All apps by Arpa Piemonte: https://appshunter.io/developer/1317255035

## Related topics

[arpa piemonte](https://appshunter.io/ios/topics/arpa-piemonte)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*